<!DOCTYPE html>
<html>
	<head>
		<meta charset="utf-8" />
		<title></title>
		<style>
			*{
				
			}
			.center{
				float: left;
				width: 100%;
				height: 400px;
				background: red;
				padding: 0 200px;
				box-sizing: border-box;
			}
			.left{
				float: left;
				width: 200px;
				height: 400px;
				background: blue;
				position: relative;
				margin-left: -100%;
	
			}
			.right{
				float: right;
				width: 200px;
				height: 400px;
				background: yellow;
				position: relative;
				margin-left: -200px;
			}
		</style>
	</head>
	<body>
		<div class="main">
			<div class="center">center</div>
			<div class="left">left</div>
			<div class="right">right</div>
			
		</div>
	</body>
</html>
